target_str = '<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>First Task</title></head><body><style type="text/css">body{height: 100vh;width: 100vw;}</style><div class="left" id="left" style="text-align: center;"><h2><span>This part should be</span><span><i>Left</i></span></h2></div><script type="text/javascript" charset="UTF-8">alert("Hello World");</script></body></html>'

if __name__ == "__main__":
    # start your Python journey
    pass